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speedup encode and decode #1
Hi, the following patchset replaces some computation by lookup tables and improve the performance a bit more. It's using ghc primitive directly but the portability line is GHC, so hopefully this is not a problem. if it's a problem, it might be possible to use bytestring overloadStrings and unsafeIndexing to almost the same performance increase (but consistently slower on some other benchmarks of mine.)
benchmarks below are means/lb/ub before and after optimization on my machine.